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Finding the Fourth Proportional to 39,796.65, 54,918.90 and 21,891.89

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Solution

The fourth proportional to 39,796.65, 54,918.90 and 21,891.89 is: 30,210.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,796.65 : 54,918.90 = 21,891.89 : x
  2. Step 2: Convert to fraction form
    39,796.65/54,918.90 = 21,891.89/x
  3. Step 3: Cross multiply
    39,796.65x = 54,918.90 × 21,891.89
  4. Step 4: Simplify right side
    39,796.65x = 1,202,278,655.02
  5. Step 5: Solve for x
    x = 1,202,278,655.02/39,796.65
  6. Step 6: Final answer
    x = 30,210.55

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.